// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

#include <spdlog/details/circular_q.h>
#include <spdlog/details/log_msg_buffer.h>

#include <atomic>
#include <functional>
#include <mutex>

// Store log messages in circular buffer.
// Useful for storing debug data in case of error/warning happens.

namespace spdlog {
namespace details {
    class SPDLOG_API backtracer
    {
        mutable std::mutex mutex_;
        std::atomic<bool> enabled_{false};
        circular_q<log_msg_buffer> messages_;

    public:
        backtracer() = default;
        backtracer(const backtracer& other);

        backtracer(backtracer&& other) SPDLOG_NOEXCEPT;
        backtracer& operator=(backtracer other);

        void enable(size_t size);
        void disable();
        bool enabled() const;
        void push_back(const log_msg& msg);
        bool empty() const;

        // pop all items in the q and apply the given fun on each of them.
        void foreach_pop(std::function<void(const details::log_msg&)> fun);
    };

}  // namespace details
}  // namespace spdlog

#ifdef SPDLOG_HEADER_ONLY
#include "backtracer-inl.h"
#endif
